It is always dangerous to run SSH on port 22. So better not to be late one should always change SSH Port to something other. Below is a method to change ssh port.
A) Login to your server through PUTTY
B) Run the commands below:
search for the line #Port 22 . Uncomment it and change 22 to something else. Press ctrl+o to save and press x to exit.
C) Restart SSH
service sshd restart
*Note: If nano is not installed run (yum -y install nano)